Headrest accessory



FIG. 1 is a front and side perspective view of a headrest accessoryshowing my new design mounted on a headrest;

FIG. 2 is a rear and side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof, the left side view being a mirrorimage;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a rear view thereof, showing my design in an unfastenedcondition.

The broken lines shown in the FIGURES are environmental only and form nopart of the claimed design.

The ornamental design for a headrest accessory, as shown and described.